External application cutting tool for drilling tool

The utility model discloses an external application cutting tool for drilling tool, including sleeve pipe, location cutting knife and removal cutting knife, the sleeve pipe top is inside to be provided with the helicitic texture, and has seted up the mounting groove below the sleeve pipe, the location cutting knife is installed to the inside below of mounting groove, and fixes a position the cutting knife side and be fixed with the position sleeve, location cutting knife and position sleeve pass through the locating pin to be fixed inside the mounting groove, and just fix a position the cutting knife upper end and link together with removing the cutting knife upper end through the pivot, move the cutting knife lower extreme and install the 2nd pushing force post, and the spring is installed to the 2nd pushing force post upper end to the spring upper end is provided with a pushing force post. This is external application sleeve pipe cutter for the rig, and this external application cutting tool passes through